Main4activity表格式GridView

public class Main4Activity extends AppCompatActivity {
private String url="http://api.tianapi.com/guonei/?key=48a7d7193e11bd2dd4a683b6e2f90a4f&num=10";
    private GridView gv;
private List<Study.NewslistBean>beans=new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main4);
        gv = findViewById(R.id.gv);
getdata();

    }
    private void getdata(){
        MyTask myTask=new MyTask(new MyTask.Icallbacks() {
            @Override
            public void updateUiByjson(String jsonstr) {
                Gson gson=new Gson();
                Study bean = gson.fromJson(jsonstr, Study.class);
                List<Study.NewslistBean> newslist = bean.getNewslist();
                MyAdapter3 myAdapter3=new MyAdapter3(newslist,Main4Activity.this);
gv.setAdapter(myAdapter3);

            }
        });
        myTask.execute(url);
    }
}

<GridView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/gv"
    android:numColumns="2"></GridView>